Camtclating device



L. E. PERRY 2,152,.,04

CALCULATING DEVICE Filed March l5, 1957 2 Sheets-Sheet l XNVEANTO w.:

ATTORNEY.

March 28, 193%. L E. PERRY 2,153,694-

CALGULATIING DEVICE Filed March l5, 1937 2`SheetS-S`neet Z FIGURE 4.

/ USE THIS SIDE OI" CALCULATOR FOR FIRST FILLING WITH MIITIIANOL ANTI-FREEZE 7. CAPACITY [j QIIARTS IF naamw UASRIE5 To mmm' `To mm ABOVE ZERO 1 ZERO FIGURE 5.

1o u u l nl 14 15 1e l 11 18| 19 12012-1 lzzlzs |24 INvEN'Ion:

DTM

ATTORNEY 4 covering all possible combinations.

Patented Mar. 1939 UNITED STATES PATENT OFFICE ,2,152,604 cancumrrmc.` DEVICE Application March 15,

4 Claims.

My invention relates to calculating devices and, more particularly, to a calculating device for readily determining the amount ofsolute required to adjust a given quantity of solution to a desired concentration.

In adjusting the concentration of solutions i which4 the initial concentrationof the solute may vary over a wide range, from 0% upward, and

the volume of which may vary over a considerable range, it is necessary to calculate separately each individual case or else refer to tabulated data In the case of solutions of liquid solutes in which there is a diminution of volume on admixture of solvent and solute, the calculation `becomes so involved as to practically require the use of tables. In view of the plurality of variables involved, it has been found necessary to employ a large number of separate tables of the necessary data or a complicated chart or nomograph which is difficult to read under practical working conditions. Thus in the case of4 alcohol anti-freeze solutions, in adjusting a radiator solution from one freezing point to a lower freezing point, it has been necessary to utilize a complicatedchart or set of tables, or else resort to trial -and error. In view of the inconvenience of such a set of tables, or the -difliculty of reading a complex chart', the latter method has commonly been employed up to the present time.

I have now discovered that the necessary data for adjustingthe concentration of solutions, such as radiator anti-'freeze solutions, may very conveniently be presented in a simple and compact calculator. The calculator of my present invention may be deiined, briefly, as comprising a member carrying indicia representing correlated present and desired concentrations, a Asecond member carrying correlated indicia representing volumes of solution and amounts of solute, the said members being movable relative to each other, and the said first member being apertured whereby one of the indicia carried by said second member, representing a volume of solution 'is visible when the corresponding indicia carried by said second member, representing amounts of solute, are visible adjacent the indicia carried by said first member. y

My invention will be illustrated by reference to one modification of the calculator which is ilillustrated in the accompanying drawings. In these kdrawings Figure 1 is a plan view of the calculator showing one of the face members thereof; Figure 2 represents one face of the slide member; Figure 3 is a sectional end view of the calculator 1937, Serial No. 130,932

(Cl. 23S-89) with the slide member removed; Figure 4 is a plan View of thesecondface member of the calculator, and Figure 5 represents the second facel of the slide member.

In this modification of the calculator a slide .5 ruletype of structure is secured in which a slide member reciprocates between two apertured face members. The face members I and 2, which may comprise cards of stiff paper board or sheets of other relatively stiff and light weight material, 10 are preferably secured together with inter-positioned strips 3 3', deiining a longitudinally exo tending slot or channel 4 in which the slide member 5 may reciprocate. The face members may be cut away, as shown at 6--6' and 1-1', 15 to facilitate manual engagement of the slide when it is in its innermost position. The face members are provided with apertures or windows 8, 9, I0, and Il, which in each instance extend through the wall of the face member and into 20 the slot or channel so that indicia carried by the slide member can readily be seen therethrough.

The illustrated modification of the calculator is designed for calculating the amount of metha- 25 no1 required for adjusting various volumes of anti-freeze solution to the desired freezing point. /For this purpose the face of the slide member'S,

illustrated in Figure 2, carries a longitudinal row of figures I2 representing various volumes of the 30 anti-freeze solution, i. e., various radiator capacities. These figures are so placed as to be in register with the aperture 8 of the face member I when the slide member 5 is in operating position.

'I'he face member I is provided with a table of data I3, adjacent the aperture 9 showing correlated present and desired freezing .points ofthe solution. 'I'he face of the slide member 5, illustrated in Figure,2, is provided with a table 40 of data I4, representing volumes of methanol, in

quarts, to be added to theradiator solution tov give the desired freezing` point. The table I4 is so positioned-as to be inregister with the aperture'S of the face member I when the slide mem- 45 ber 54,15 in operating position, whereby one vertical column of the table is visible through the 'said aperture 9.

The longitudinal row of figures I2 and the vertical columns of the table I4 carried by the 50 face of the slide member v5, illustrated in Figure 2, are correlated, as to position, whereby when any given volume figure is visible through the aperture 8, the corresponding vertical column of the table I4 1s visible through the aperture s. 5s'

ber l so that the radiator capacity ot-thecar, in quarts, is shown through the aperture I, and the amount `ot methanol to be added to the radiator sohitionlsthenshownthroughtheaperturel `in horizontal register with the correlated. present and'desired freezing points ci' the radiator solution shown in the table II.

The second face of the slide member I, illus-A trated in -Flgure 5, is similarly provided with a longitudinal row o! ngures Ii, representing radiator capacities. and a table of data It, representing amounts of methanol to be added.

Therowoi'ngures Ilandthetable ila'repositioned to register with the apertures Il and il oi face member 2 when the slide member lis in l operating position. vThe ngures of the longitudinal row Il and the vertical columns of the table II are correlated, as to position, such that when a given radiator capacity is visible through the aperture I0, the corresponding vertical column of the table Il is visible through the aperture Il. The tace member 2 carries a table of freezing points adjacent the aperture I i, in this case all of said freezing points being correlated to an initial freezing point of 32 F. Thus, tace member land solution which already contains some methanol.`

'Ihe operation of face member 2 and itscorresponding face of the slide member is identical with that previously described for face member i. ,In this case the slide member 5 is adjusted so that the radiator Vcapacity of the car is visible through the aperture It; and the required amounts of methanol will then be visible through the aperture Ii in horizontal register with the desired freezing points, which are carried by the face member 2 adjacent the aperture I i.

It may be seen that the modification of my invention described above is advantageous from the standpoint'ot eompactnessand ease of operation.` A device of this character is particularly advantageous forv use under practical working 5 .conditions such as encountered in filling station servicing of automobiles lor anti-freeze protection. With the use of this device only the necessary minimum amount of data is visible at any one setting of` the device, and thev results are obtainable by reading columns of ngures immediately adjacent to each other, thus `eliminating the errors involved in the use of large and tages oi'rthis device will have been apparent from.

the preceding description.

It will be evident, of course, that the particular exemplincation of my invention, described above and shown in the drawings, is illustrative only and that. my invention is not limited to this specific structure. It willr b'e apparent to one skilled in the art that the structure shown could be modified in numerous respects. For example,

In this manner it is possible to setthe slide memthe apertures in the ,'i'ace members might be placed toward the ends rather than centrally, and theslide could then be designed tooperate only from one end o! the calculator rather than from both ends, as shown. Hkewiservthe data-on both faces of the slide member could'be combined on one tace member by adding to' the table Il, l

solute for any type ot solution desired to be adjusted, instead of the particular indicia'shown for the methanol anti-freeze solutions. It will also be apparent that the physical structure could be modined in numero/us respects as long as there,

are provided two members carrying the necessary yindicia.movable relative to each other, one of said members being apertured in a manner to permit operation as described above. In general, it may be said that any modifications or equivalents which would naturally occur to one skilled in the art are included within the scope of my invention. Y,

My invention now having been described, vwhat I claim is:

l. A device-dor calculating the amount ot a solute required to adjust a given volume oi a solution to a desired concentration, comprising a member carrying indicia representing correlated present and desired concentrations. a second member carrying correlated indicia representing volumes of solution andamounts of solute to be added, the said members being movable relative to eachother, and the said rst member being apertured whereby when one of the indicia carried by said second memberj representing a volume of solution, is visible, the corresponding indicia carried by said second member, representing amounts of solute to be added, are visible adjacent-the indicia carried by said ilrst member.

2. A device for calculating the amount of an anti-freeze required to adjust a given volume of an anti-freeze solution to a desired freezing point, comprising a member carrying indicia representing correlated present and desired freezing points, a second member carrying correlated indicia `representing volumes of anti-freeze solution and amounts of anti-freeze to beadded, the said members being movable relative to each other, and the said first member being apertured whereby when one of the indicia carried byvsaid second member, representing a volume of anti-freeze solution, is visible, the corresponding indicia carried by said second member,l representing amounts of' anti-freeze to be added, are visible adjacent the indicia carried by said iirst member.

3. A device for calculating the amount of a solute required to adjust a given volume of a solution to aV desired concentration, comprising two face members positioned in spaced relation and denning a channel therebetween, the said face members carrying indicia representing correlated present and desired concentrations, a slide member carrying correlated indicia representing volumes of solution and amounts'of solute to be added, said slide member being adapted to reciprocate in the channel between said face members, and said face members being apertured whereby when one `of the indicia carried by said slide member, representing a volume of solution, is visible through an aperture in one of said face members, the'corresponding indicia carried by member being adapted to reciprocate in the channel between the said face members, and the said face members being apertured whereby when one of the indicia carried by' said slide member, representing a volume of anti-freeze solution. is visible through an aperture in one of the face members, the corresponding indicia carried by said lslide member, representing amounts of antifreeze to be added, are visible through an aperture adjacent the indicia. carried by said face 10 member.

LESTER E. PERRY. 

